Faces

Face Detection detects multiple faces within an image and provides coordinates
of key facial features. It also returns emotional state predictions (such as
joy, anger, and surprise) and whether headwear is being worn.

Landmarks

Landmark requests detect well-known natural and human-made landmarks, and return
identifying information such as an entity ID (that may be available in the
Google Knowledge Graph), the landmark's name and location, and the bounding
box that surrounds the landmark in the image.

Note: Using this API in a mobile app? Try
ML Kit for Firebase, which provides
native Android and iOS SDKs for using Cloud Vision services, as well as
on-device ML Vision APIs and on-device inference using custom ML models.

Logos

Logo detection requests detect popular product and corporate logos within
an image. The response includes the logo name, an entity ID (that may be
referenceable in the Google Knowledge Graph), and the bounding box that
surrounds the logo position in the image.

Web entities

Web entities requests return information about the contents of the image as
they relate to the Google Knowledge Graph, as well as the image's relation to
other pages and images on the web.

The response includes entity IDs that are detected (which may be referenceable
in the Google Knowledge Graph), web pages that contain this exact image,
URLs of exact matches and partial matches on the image, and URLs of visually
similar images.